diff --git a/plugins/LegacyProfileReader/DictionaryOfDoom.json b/plugins/LegacyProfileReader/DictionaryOfDoom.json
index 9be77093de..e222486750 100644
--- a/plugins/LegacyProfileReader/DictionaryOfDoom.json
+++ b/plugins/LegacyProfileReader/DictionaryOfDoom.json
@@ -69,7 +69,7 @@
         "magic_mesh_surface_mode": "simple_mode",
         "magic_spiralize": "spiralize",
         "prime_tower_enable": "wipe_tower",
-        "prime_tower_size": "sqrt(wipe_tower_volume / layer_height)",
+        "prime_tower_size": "math.sqrt(float(wipe_tower_volume) / float(layer_height))",
         "ooze_shield_enabled": "ooze_shield"
     }
 }
\ No newline at end of file